// Problem: 
// Contest: 
// URL: 
// Memory Limit: 
// Time Limit: 
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#include<bits/stdc++.h>
using namespace std;
#define int long long
inline int read(){
	int s=0,w=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
	while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
	return s*w;
}
int n,m;
vector<string> v;
signed main()
{
	cin>>n>>m;
	v=vector<string>(m);
	map<string,int> g;
	for(int i=0;i<n;i++)
	{
		for(int j=0;j<m;j++)
		{
			char c;
			cin>>c;
			v[j]+=c;
		}
	}
	for(int i=0;i<m;i++)g[v[i]]++;
	int ans=0;
	for(auto [s,v]:g)ans=max(ans,v);
	cout<<ans<<endl;
	return 0;
}
